libsdl2: Add libunwind-native to the libsdl2-native DEPENDS
This fixes this CMake configuration error:
| -- Checking for one of the modules 'libunwind'
| CMake Error at [...]/build/tmp/work/x86_64-linux/libsdl2-native/2.0.20-r0/recipe-sysroot-native/usr/share/cmake-3.22/Modules/FindPkgConfig.cmake:890 (message):
| None of the required 'libunwind' found
| Call Stack (most recent call first):
| CMakeLists.txt:1367 (pkg_search_module)
This error happens even if libunwind is installed complete with its C
headers and development .so files (in Ubuntu, this means libunwind-dev
is installed).
Signed-off-by: Carlos Rafael Giani <crg7475@mailbox.org> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
